Linking error when compiled to `arm64ec-pc-windows-msvc`

[Wyvern]

On windows compiled to arm64ec-pc-windows-msvc target with -Zbuild-std got linking error:

error: linking with `link.exe` failed: exit code: 1120
  = note:    Creating library D:\a\Img\Img\build-dir\arm64ec-pc-windows-msvc\src\deps\Img.lib and object D:\a\Img\Img\build-dir\arm64ec-pc-windows-msvc\src\deps\Img.exp␍
          symbols.o : error LNK2001: unresolved external symbol #_RNxC3std12H7JG8fmF3Zv8 (EC Symbol)␍
          D:\a\Img\Img\build-dir\arm64ec-pc-windows-msvc\src\deps\Img.exe : fatal error LNK1120: 1 unresolved externals␍

Rust 1.87.0-nightly (ecade53 2025-03-14)

[Palkovsky]

I'm getting similar one, since 1.85, without even using -Zbuild-std:

PS C:\Code> cargo new hello-word
PS C:\Code> cd hello-world
PS C:\Code\hello-world> cargo build --target arm64ec-pc-windows-msvc
   Compiling hello-world v0.1.0 (C:\Code\hello-world)
error: linking with `link.exe` failed: exit code: 1120
  |
  = note: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\MSVC\\14.43.34808\\bin\\HostX64\\arm64\\link.exe" "/NOLOGO" "C:\\Users\\damacek\\AppData\\Local\\Temp\\rustcvHVlMY\\symbols.o" "<7 object files omitted>" "<sysroot>\\lib\\rustlib\\arm64ec-pc-windows-msvc\\lib/{libstd-*,libpanic_unwind-*,libwindows_targets-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libunwind-*,libcfg_if-*,liballoc-*,librustc_std_workspace_core-*,libcore-*,libcompiler_builtins-*}.rlib" "kernel32.lib" "kernel32.lib" "ntdll.lib" "userenv.lib" "ws2_32.lib" "dbghelp.lib" "/defaultlib:msvcrt" "/machine:arm64ec" "softintrin.lib" "/NXCOMPAT" "/OUT:C:\\Code\\hello-world\\target\\arm64ec-pc-windows-msvc\\debug\\deps\\hello_world.exe" "/OPT:REF,NOICF" "/DEBUG" "/PDBALTPATH:%_PDB%" "/NATVIS:<sysroot>\\lib\\rustlib\\etc\\intrinsic.natvis" "/NATVIS:<sysroot>\\lib\\rustlib\\etc\\liballoc.natvis" "/NATVIS:<sysroot>\\lib\\rustlib\\etc\\libcore.natvis" "/NATVIS:<sysroot>\\lib\\rustlib\\etc\\libstd.natvis"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: symbols.o : error LNK2001: unresolved external symbol #_ZN3std9panicking11EMPTY_PANIC17hc8d2b903527827f1E (EC Symbol)␍
          C:\Code\hello-world\target\arm64ec-pc-windows-msvc\debug\deps\hello_world.exe : fatal error LNK1120: 1 unresolved externals␍


error: could not compile `hello-world` (bin "hello-world") due to 1 previous error

@dpaoliello Any ideas?

[dpaoliello]

I can reproduce with 1.86, will investigate...

[dpaoliello]

I have a root cause and a fix: Rust is decorating all symbols with # for Arm64EC, when it should only be decorating functions. Running tests now and will have a PR out shortly.